Poerschke topped ninth-seeded Pedro Rico of Pepperdine 6-3, 6-7 (3), 6-4 in the first round and Pacific’s Arnar Sigurdsson 6-1, 6-1 in the second round.

Kohlloeffel is seeded third.

Top-seeded Ryler DeHeart of Illinois reached the final 16, but second-seeded Ludovic Walter of Duke was upset 6-4, 6-2 by Stanford freshman Matt Bruch, a qualifier who reached the third round of last month’s U.S. Open junior tournament.

WOMEN’S TENNIS: USC’S FINK REACHES SECOND ROUND

USC freshman Amanda Fink, from Calabasas High, ran her winning streak to seven matches at the Riviera/ITA Women’s All-American Championships tennis tournament, defeating New Mexico’s Maja Kovacek 6-3, 6-4 in a first-round match at Riviera Country Club in Pacific Palisades.

Fink, the 2004 Daily News Girls’ Tennis Player of the Year at Calabasas, advanced to the main draw of the first of three college women’s national championship tournaments with triumphs during prequalifying at UCLA and qualifying at Riviera.

Top-seeded Jennifer Magley of Florida was upset 6-2, 6-2 by Stanford’s Anne Yelsey, a junior from Newport Beach. Magley is the first No. 1 seed to lose in the opening round in the tournament’s 23-year history.

Two other Stanford players advanced to Friday’s round of 16: Theresa Logar, who will face Fink, and eighth-seeded Alice Barnes.

USC’s Anca Anastasiu and Carine Vermeulen, both from South Africa, lost in the first round of women’s doubles, falling 8-3 to California’s Susie Babos and Zsuzzana Fodor.